Current Search: Biological control systems (x)
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- Title
- An investigation of the possible intermittent dynamics in the transition region between two modes of behavior using delays.
- Creator
- Holroyd, Tom, Florida Atlantic University, Kelso, J. A. Scott, Charles E. Schmidt College of Science, Department of Psychology
- Abstract/Description
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In this thesis the transition region between two modes of behavior is explored using a novel technique, delayed feedback, and a variety of dynamical systems measures. In a previous study, Engstrom, Kelso, and Holroyd (to appear) established the existence of a transition between anticipatory and reactive behavior in a sensorimotor coordination task as a control parameter (frequency) was varied. Here, in order to explore the hypothesis that the behavioral dynamics during this transition are...
Show moreIn this thesis the transition region between two modes of behavior is explored using a novel technique, delayed feedback, and a variety of dynamical systems measures. In a previous study, Engstrom, Kelso, and Holroyd (to appear) established the existence of a transition between anticipatory and reactive behavior in a sensorimotor coordination task as a control parameter (frequency) was varied. Here, in order to explore the hypothesis that the behavioral dynamics during this transition are intermittent in character, subjects were asked to synchronize with a metronome that was actually a delayed copy of their own response pattern. The use of delayed feedback was expected to destabilize the behavioral dynamics enough to allow the observation of hypothesized intermittent phenomena. Use of delayed feedback was shown to destabilize synchronization, resulting in the emergence of a new behavioral pattern in the transition region that exhibited complex "bursting" dynamics. Analysis revealed that this bursting behavior displays many of the characteristics common to intermittency, which supports the idea that the anticipation-reaction transition is the result of a neurobehavioral dynamical system losing stability. Living in the vicinity of instabilities may be an important mechanism for biological organisms to maintain both flexibility and stability.
Show less - Date Issued
- 1994
- PURL
- http://purl.flvc.org/fcla/dt/15042
- Subject Headings
- Biological rhythms, Human mechanics, Circadian rhythms, Biological control systems
- Format
- Document (PDF)
- Title
- Neural Information Processing Underlying Rhythmic Bimanual Coordination: Theory, Method and Experiment.
- Creator
- Banerjee, Arpan, Jirsa, Viktor K., Florida Atlantic University
- Abstract/Description
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How do neuronal connectivity and the dynamics of distributed brain networks process information during bimanual coordination? Contemporary brain theories of cognitive function posit spatial, temporal and spatiotemporal network reorganization as mechanisms for neural information processing. In this dissertation, rhythmic bimanual coordination is studied as a window into neural information processing and subsequently an investigation of underlying network reorganization processes is performed....
Show moreHow do neuronal connectivity and the dynamics of distributed brain networks process information during bimanual coordination? Contemporary brain theories of cognitive function posit spatial, temporal and spatiotemporal network reorganization as mechanisms for neural information processing. In this dissertation, rhythmic bimanual coordination is studied as a window into neural information processing and subsequently an investigation of underlying network reorganization processes is performed. Spatiotemporal reorganization between effectors (limbs) is parameterized in a theoretical model via a continuously varying cross-talk parameter that represents neural connectivity. Thereby, effector dynamics during coordinated behavior is shown to be influenced by the cross-talk parameter and time delays involved in signal processing. In particular, stability regimes of coordination patterns as a function of cross-talk, movement frequency and the time delays are derived. On the methodological front , spatiotemporal reorganization of neural masses are used to simulate electroencephalographic data. A suitable choice of experimental control conditions is used to derive a paradigmatic framework called Mode Level Cognitive Subtraction (MLCS) which is demonstrated to facilitate the disambiguation between spatial and temporal components of the reorganization processes to a quantifiable degree of certainty. In the experimental section, MLCS is applied to electroencephalographic recordings during rhythmic bimanual task conditions and unimanual control conditions. Finally, a classification of reorganization processes is achieved for differing stability states of coordination: inphase (mirror) primarily entails temporal reorganization of sensorimotor networks localized during unimanual movement whereas spatiotemporal reorganization is involved during antiphase (parallel) coordination.
Show less - Date Issued
- 2007
- PURL
- http://purl.flvc.org/fau/fd/FA00000849
- Subject Headings
- Neural networks (Computer science), Biological control systems, Mind and body, Cognitive psychology
- Format
- Document (PDF)
- Title
- An exploratory study of biofeedback in reducing pain after thoracic surgery.
- Creator
- Angel, Laurie R., Florida Atlantic University, Freeman, Edward
- Abstract/Description
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This study is a pilot concerning the relationship between acute pain management and biofeedback training. The population studied included patients from a local community hospital undergoing coronary artery bypass graft surgery. The study applied theories of the mind/body connection and stress frameworks for exploring the correlation between patients' hand temperatures and their reported levels of pain pre-operatively and post-operatively. Study findings indicated that there was significant...
Show moreThis study is a pilot concerning the relationship between acute pain management and biofeedback training. The population studied included patients from a local community hospital undergoing coronary artery bypass graft surgery. The study applied theories of the mind/body connection and stress frameworks for exploring the correlation between patients' hand temperatures and their reported levels of pain pre-operatively and post-operatively. Study findings indicated that there was significant within-subjects effect in hand temperature after biofeedback treatment across three points in time. But the study also found no difference between-subjects in hand temperature after biofeedback treatment across three points in time. Therefore, the sample proved to be heterogeneous. Further study was indicated with larger samples to demonstrate the analgesic effects of biofeedback in the management of acute pain.
Show less - Date Issued
- 1997
- PURL
- http://purl.flvc.org/fcla/dt/15489
- Subject Headings
- Biological control systems, Pain--Treatment, Mind and body, Pain--Psychological aspects, Nurse and patient
- Format
- Document (PDF)